Dowel pinhole-boring machine



Oct.6,1925. 1,555,540

(5. E. PATTERSON DOWEL PINHOLE BORING MACHINE Filed Sept. 14. 1923 2 Sheets-Sheet 2 F/c; 5- I 4' ATTORNEY i Patented Oct. 6,1925. 1 it 1,556,540

UNITED T TES PATENT men;

PATTEBSQNQOI GBEENWICB, comm ns we remoteeams rewin- Application filed September 14, 1923. Serial .80. 662,532.

To all whom it may concern: at an angle of about degrees from the Be it known that Gnoncn E. Pn'rrnnsorr, horizontah'so that the faces 10 lie in a'plane a citizen of the United States, residing at perpendicular to the extended plane of'the Greenwich, in the county ofFairfield "and connecting ribs 8. Elongated elevator dogs 5 State of Connecticut, has inventedcertain 11 are also tormediiitegrally with the shoes 00 new and useful Improvements in Dowel 1, the dogs being located on the innersides Pinhole-Boring Machines,of which the fol of the shoes and set at an angle" o'f'35 d'e lowing is a specification. grees' thereon so as to correspond to the This invention is in the way of adowel'pin inclinati n of the ribs 8. A" stock bed 12 1Q holeborin g machine, fortheuse of carpenters is secured across the upper ribs 6 of the and mechanics generally, and the object of shoes 1 by screws 13passed up through the the'invention is to provide a simple, pracribs 6 into the bed '12. A toolbed-" lfl is tical and efficient tool tofacilitate the cenmounted and adapted for vertical adjusttering and aligning of the boring bitof a ment upon the lower ribs 7 bymeans of 15 handbrace in the process of boring dowel angle-plates 15 secured to the under side of pinholes in wood stock of any kind. The the bed 1 by screws 16, adjacent the inner tool'is of especial value where many such sides of the shoes 1. These angle-plates 15 holes are to be bored'in a regular and unihave integrally formed elevator dogs 17 set form run of stock. at an angle of 35 degreesand adapted to 2 In the drawingsslidinglyintermesh with the similar dogs 11 7 Figure 1 is a top plan view of the device; on the shoes 1. Feed screw anchor plates Figure 2 is a front elevation; 18 are secured by screws 19 to the front edge Figure 3 is a side elevation; of the bed 14, andthe'se plates have down- *Figure 4 is a rear elevation; ward-1y and inwardly turned lips 20 pierced 2P Figure 5 is a bottom view; with holes 21', the lips 20 standing immedi- Figure 6 is a-longitudinal vertical section; ately back of and substantially parallel to Figure 7 is a detail of the bit cradle'and thetaces 10 0f the lugs 9. The'lugs 9 are attachments; pierced with threaded holes 22, and feed Figure 8 is a detail of the tool bed elevator Screws 23 are passed through these holes,

30 dogs' as mounted in connection with the their inner reduced. 611(1824 passing. through shoes; the holes 21 of the arichorplates18 and Figure 9 is a detail of the sliding lock being there rotatively secured by means of mechanism and centering scale thereon. Cotter ins 25 P d ugh the'saoid e Fig. 10 is a detail of an angle plate. back 0 the lips 20. It is now apparent that 36 In carrying out this invention, I provide by turning up the feedscrews' 23, thetool two shoes 1, which -may be made of cast bed 14 will be pushed upwardly, the dogs 17 metal and angular in cross section as shown. m ving Over the dogs 11 of the shoes 1'.

These shoes are designed to be secured hori- A 'UrShaPBd Clamp p g 2 is zontally and in spaced parallel relation, perthrough at the central back edge of the bed 10 p ndi l rl t th f m edgei of theordi- 14L A scale strip or fence 27 is secured nary work bench 3; and for this purpose, anvertically along the back edge of the bed chor lugs 4 are formed integrally upon the 1 1, the same having an integrally formed lower edgesof the shoes, the'said lugs being central fence block or hit guide block 28, pierced with screw holes, through whi h th through which the bit guide hole '29 is cut a5 Screws 5 are inserted into the bench The perpendicularly to the face of the fence shoes 1 are formed with upperribs 6 at'the 2-7. This hole is made suflic'ientl'arge, so back endsthereof, and lower ribs 7 at the that the bushing 30 maybe mounted therefrom ends thereof, the two-lying in difierent, in and releasably locked in place by a set spaced and'parallel, horizontalplanes and screw 31 passed down through the top of 50 being connected'by short ribs 8 which join the block .28. By using bushings of varithe'ribs '6 and 7 at an angle of approximateous degrees ofthicknes's, a suitable guide 1y 35 degrees trom the horizontal. The may be formed for bits of various sizes. A shoes 1 carry integrally formed feed screw centering point 3 2 projects rearwardly from lugs 9'at their front ends which are turned the block 28'. Slots '33 are cut through the laterally inward andtaced'o fi underneath fence 27 at eachside oi the block 28, the

said slots being elongated horizontally; and sliding guides 34 are mounted back of the fence 27 at the slots 38, and freely held in place by means of threaded pins 35 fixed in the guides and extended through the slots, and with thumb nuts 36 mounted on the ends of the pins. Calibrated scales 37 are marked on the fence 27 at each side of the centering point 82, and thus means are afforded for adjusting the guides 34 for the boring of small stock. For large or wide stock, the guides 34 may be removed from the fence. For holding the stock firmly to the stock bed 12, clamping means are provided, consisting of curved clamp arms 38 having their lower ends secured by screws 39 to the under side of the stock bed at the forward edge thereof, and having their upper ends connected by the integrally formed clamp plate 40 through which the threaded hole 41 is cut. A clamp screw 42 is then mounted through this hole 41 and its lower end is rotatively anchored to a clamp 43. In order to steady the clamp 43, guide pins 44 are extended vertically therefrom and slidingly passed through holes 45 in the ends of the plate 40. A bit cradle 46 is mounted at the front edge of the tool bed 14 and centrally aligned with the guide block 28. This cradle includes a bed plate 47, concaved centrally at 48 to accommodate the chuck of a brace, and having four integral spindle posts 49, one at each corner thereof. The plate 47 is secured to the front edge of the tool bed 14 by screws 50. The posts 49 are pierced with spindle holes 51 and spindles 52 are slidingly mounted therethrough, one spindle at each'side of the cradle. A guide bar 53 spans the spindles 52 and is releasably locked thereto. For this purpose, the bar is pierced at each end with a hole 54, through which the spindle is passed, and set screws 55 are then passed through the ends of the bar 53 and seated against the spindles. The bar 53 is provided with a central bit slot 56 cut down thereinto through the upper edges, and a locking gate 57 is pivoted at 58 to the bar 53 and has a central bit slot 59 cut therein, upwardly through the lower edge, the said slot being complementary to the slot 56, and the two serving together to completely embrace the shank of the bit 60 mounted in the apparatus. The gate 57 has a latch slot 61 cut at its free end and adapted to engage screw 62 set in the bar for locking the 57 in closed position. Two stops 63 and 64 are provided and may be demountably set upon the shank of the bit 60, one at each side of the bar '53. For this purpose, slots 65 are out through the outer edges to the center and set screws 66 are passed laterally through and adapted to bear upon the shank of the bit. The outer stop acts as a depth stop to prevent the bit entering too far into the stock, and the inner stop serves both to draw back the bar when the bit is withdrawn from the stock, and allso to prevent the bit from leaving the bushing 00. bliding gauge locks 67 are mounted one at each side of the device and provide means for locking the bed 14 at any desired point in its travel on the intermeshing dogs 17 and 11. These locks include links 68 pivoted at 69 to the ends of the stock bed 12 and have slots 7 0 cut therein. "Ihreaded pins 7i are extended from the end of the tool bed 14 out through the slots 70, and nuts 72 are mounted on the ends of these pins. Urauge notches 73, are out along the upper edges ofthe links 68. By manipulation of the feed screws 23, the bed 14 and the bit to may be elevated as required in order to vertically center the bit to the stock being worked upon, after which the bed 14 may be locked in that position by turning up the nuts 72. In the drawing the three gauge notches '73 indicate the points at which the bed 14 must be locked in order to center the bit for stock, 1 stock and 1% stock, respectively.

While I have herein described a certain specific manner and method of constructing and assembling the elements of my invention, it is understood that I may vary from the same in minor details, not departing from the spirit of my invention, so as best to construct a practical device for the purpose intended, as defined in the appended claims.

I claim:

1. A device of the kind described, comprising shoes positioned horizontally in parallel spaced relation, the samehaving lower rearwardly extended stock bed ribs, and forwardly extended and relatively lower tool bed ribs, the latter ribs having integrally formed elongated dogs on their inner sides and inclinded upwardly from their front ends to their back ends; a stationary stock bed on the rear ribs of the shoes; a vertically adjustable tool bed having elongated inclined dogs at its side edges complementarily and slidingly intermeshing with the dogs of the said shoes; means for clamping the stock to the stock bed; and means for adjnstably supporting the bit on the tool bed and centering the bit to the stock.

2. A device of the kind described, comprising shoes positioned horizontally in parallel, spaced relation; elongated, spaced. dogs on the inner sides of the forward ends of the shoes, the same being inclined upwardly from front to back; a stationary stock bed mounted transversely on the rear ends of the shoes; a vertically adjustable tool bed mounted transversely on the forward ends of the shoes; elongated, spaced dogs at the side edges of the tool bed complemental to and slidingly intermeshing with the dogs of the shoes; means for clamping the stock to the stock bed; means for adjustably supporting the bit on the too] bed; and separate means for centering the bit laterally upon the stock.

3. A device of the kind described, comprising shoes ositioned horizontally in parallel, spaced relation; elongated, spaced dogs on the inner sides of the forward ends of the shoes, the same being inclined upwardly from front to back; a stationary stock bed mounted transversely on the rear ends of the shoes; a vertically adjustable tool bed mounted transversely on'the for- Ward ends of the shoes; elongated, spaced dogs at the side edges of the tool bed oomplemental to and slidingly intermeshing with the dogs of the shoes; means for clamping the stock to the stock bed; means for adjustably supporting the bit on the tool bed; separate means for centering the bit laterally upon the stock; and means dependent upon the interplay of the said intermeshing dogs of the tool bed and shoes for vertically adjusting and supporting the tool bed relative to the stock bed.

In testimony whereof I afiix my signa ture.

GEORGE E. PATTERSON. 

